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57 lines
2.0 KiB
57 lines
2.0 KiB
4 weeks ago
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var round = Math.round;
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export function subPixelOptimizeLine(outputShape, inputShape, style) {
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if (!inputShape) {
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return;
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}
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var x1 = inputShape.x1;
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var x2 = inputShape.x2;
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var y1 = inputShape.y1;
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var y2 = inputShape.y2;
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outputShape.x1 = x1;
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outputShape.x2 = x2;
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outputShape.y1 = y1;
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outputShape.y2 = y2;
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var lineWidth = style && style.lineWidth;
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if (!lineWidth) {
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return outputShape;
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}
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if (round(x1 * 2) === round(x2 * 2)) {
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outputShape.x1 = outputShape.x2 = subPixelOptimize(x1, lineWidth, true);
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}
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if (round(y1 * 2) === round(y2 * 2)) {
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outputShape.y1 = outputShape.y2 = subPixelOptimize(y1, lineWidth, true);
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}
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return outputShape;
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}
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export function subPixelOptimizeRect(outputShape, inputShape, style) {
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if (!inputShape) {
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return;
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}
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var originX = inputShape.x;
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var originY = inputShape.y;
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var originWidth = inputShape.width;
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var originHeight = inputShape.height;
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outputShape.x = originX;
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outputShape.y = originY;
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outputShape.width = originWidth;
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outputShape.height = originHeight;
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var lineWidth = style && style.lineWidth;
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if (!lineWidth) {
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return outputShape;
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}
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outputShape.x = subPixelOptimize(originX, lineWidth, true);
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outputShape.y = subPixelOptimize(originY, lineWidth, true);
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outputShape.width = Math.max(subPixelOptimize(originX + originWidth, lineWidth, false) - outputShape.x, originWidth === 0 ? 0 : 1);
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outputShape.height = Math.max(subPixelOptimize(originY + originHeight, lineWidth, false) - outputShape.y, originHeight === 0 ? 0 : 1);
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return outputShape;
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}
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export function subPixelOptimize(position, lineWidth, positiveOrNegative) {
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if (!lineWidth) {
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return position;
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}
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var doubledPosition = round(position * 2);
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return (doubledPosition + round(lineWidth)) % 2 === 0
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? doubledPosition / 2
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: (doubledPosition + (positiveOrNegative ? 1 : -1)) / 2;
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}
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